This Saturday (3), areas of instability are expected to advance across much of the country and gain strength, especially from the afternoon onwards.
According to the National Institute of Meteorology (Inmet), an area of low pressure between the north of Argentina and the west of Paraguay should favor the transport of hot and humid air towards the south of Brazil.
A trough — an elongated area of low pressure — also helps maintain unstable weather in the region.
In the Southeast, the highest volumes of rain predicted for Saturday are concentrated in the southeast of Minas Gerais and the west of Rio de Janeiro. These areas are under a red warning of high danger for large accumulations.
There is also a forecast of heavy rain between the northwest, north and east of São Paulo, the Triângulo Mineiro, the center and east of Minas Gerais and the center and south of Espírito Santo. In these areas, Inmet maintains an orange warning.
In the morning, São Paulo may still have periods of firmer weather in some areas. From the afternoon onwards, however, instability is expected to increase and spread rain across much of the Southeast. Minas Gerais, Rio de Janeiro and Espírito Santo can also record thunderstorms.
In Rio de Janeiro (RJ), the temperature should vary between 19°C and 23°C. In Belo Horizonte (MG) and Vitória (ES), the predicted maximum is 25°C, under milder and more unstable weather.
In the South, Saturday should start calmer in several areas, but the condition changes throughout the day. The clouds increase and, between the afternoon and evening, the rain should advance mainly over Rio Grande do Sul, west of Santa Catarina and west of Paraná.
Pedestrians protect themselves from the rain in the central region of São Paulo in May 2025. — Photo: CRIS FAGA/DRAGONFLY PRESS/ESTADÃO CONTEÚDO
Rio Grande do Sul is expected to experience the strongest storms in the region this Saturday. There is a forecast of moderate to heavy rain, thunderstorms, hail and intense gusts, mainly in the center-west and southwest of the state. In isolated points, gusts can reach 90 km/h or exceed this value.
In Santa Catarina, the most unstable areas should appear mainly in the west. In Paraná, the showers tend to reach the western and northern half of the state first. Gusts can reach around 70 km/h in the west and central-south of Santa Catarina and in the southwest of Paraná.
Saturday will also be one of change in the Midwest. Mato Grosso, Goiás, Distrito Federal and parts of Mato Grosso do Sul should have many clouds and isolated showers. In areas of northeastern Mato Grosso and northern Goiás, rain may be accompanied by thunderstorms.
Map shows rain forecast for this Saturday across Brazil. — Photo: CPTEC/Inpe
In Brasília (DF), the temperature should vary between 18°C and 25°C. Goiânia (GO) can reach 26°C, Campo Grande (MS), 30°C, and Cuiabá (MT), 32°C.
In the North, the rain should appear mainly in Amazonas, Tocantins, central and southern Pará, as well as parts of Rondônia and Roraima. The north of Pará and Amapá should have firmer weather on Saturday. Maximum temperatures can reach 36°C in Boa Vista (RR), Belém (PA), Manaus (AM) and Porto Velho (RO).
In the Northeast, the most unstable areas are in the interior, mainly in the center and south of Maranhão, the center, south and west of Piauí and the west and southwest of Bahia. At night, it may also rain separately on stretches of the coast between Bahia and Rio Grande do Norte.
The heat remains strong in the northeastern interior. Teresina (PI) can reach 39°C, while the other capitals in the region are expected to register maximum temperatures between 30°C and 32°C.
Minimum temperatures predicted for this Saturday across Brazil. — Photo: CPTEC/Inpe
What is the weather like on Election Sunday?
The first round of the 2026 elections will see unstable weather in much of the country this Sunday (4). According to the National Institute of Meteorology (Inmet), rain and thunderstorms are forecast in areas of the five regions, in addition to warnings for storms in several states.
In the South, Sunday should be marked by rain in Paraná and Santa Catarina, in addition to the northwest and east of Rio Grande do Sul.
The greatest risk is in the west and southwest of Paraná, where there is a red warning of great danger for storms.
An extratropical cyclone formed near the coast of the Southern Region is expected to maintain unstable conditions throughout Sunday.
A cold front associated with the system is also expected to help spread rain and thunderstorms across the region.
In the Southeast, the forecast indicates rain in much of São Paulo, Minas Gerais and Rio de Janeiro. The north of Minas Gerais should have firmer weather. In São Paulo (SP), the temperature can vary from 15°C to 27°C, and in Rio de Janeiro (RJ), the maximum can reach 30°C.
In the Midwest, Sunday should also be rainy. Goiás, the Federal District, northern Mato Grosso and a large part of Mato Grosso do Sul may experience rain accompanied by thunderstorms. The south of Mato Grosso do Sul is under an orange warning for storms.
In the North, the rain should mainly hit Amazonas, Acre, Rondônia and Tocantins. There is also a risk of storms in parts of Pará. Areas of Roraima, Amapá and northern Pará should have more periods of firm weather.
In the Northeast, Sunday should be mostly sunny in much of the interior. The rain appears more isolated in the west of Bahia, on the coast of Maranhão and in stretches of the coast between Bahia and Rio Grande do Norte. Teresina (PI) can reach 39°C.
— Photo: Disclosure/TRE-AM
